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QI: Fachverband Quanteninformation
QI 21: Focus Session: Nanomechanical Systems for Classical and Quantum Sensing III (joint session HL/DY/TT/QI)
QI 21.6: Talk
Thursday, March 21, 2024, 12:15–12:30, EW 202
Brillouin scattering selection rules in elliptical optophononic resonators — •Anne Rodriguez1,2, Priya Priya1, Edson Cardozo de Oliveira1, Abdelmounaim Harouri1, Isabelle Sagnes1, Florian Pastier3, Martina Morassi1, Aristide Lemaître1, Loic Lanco1, Martin Esmann1, and Daniel Lanzillotti-Kimura1,4 — 1Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, CNRS, Palaiseau, France — 2present address: Chair for Nano and Quantum Sensors, Technische Universität München, Garching, Germany — 3Quandela SAS, Palaiseau, France — 4Institut für Physik, Universität Oldenburg, Germany
The selection rules of spontaneous Brillouin scattering in bulk crystalline solids are intrinsic material properties that formally constrain the energy, direction and polarization of the scattered photons for a given input state. In this work, we manipulate the polarization states of the input laser and Brillouin signal independently using polarization-sensitive optical micropillar cavities. The ellipticity of the micropillars lifts the degeneracy of the optical cavity modes, and induces a wavelength-dependent rotation of polarization [1,2], altering the Brillouin scattering selection rules. We developed a Brillouin spectroscopy scheme based on polarization filtering, allowing to measure acoustic phonon resonances with frequencies in the range of 20-100 GHz [3], with background-free spontaneous Brillouin scattering spectra.
[1] H. Wang et al., Nat. Phot. 13, 770 (2019). [2] B. Gayral et al., APL 72, 1421 (1998). [3] A. Rodriguez et al., ACS Photonics 10, 1687 (2023).
Keywords: Brillouin scattering; micropillar cavity; Polarization selection rules